Lightning-arrester.



EXAMINEI 1 0 6 84- CROSS REFERENCE 1 No. 882,265. PATBNTED MAR. 17, 1908'. N. J. NBALL. LIGHTNING ARRBSTER.

APPLICATION IILBD. JAE. 24, 1906.

m/ 6 -IM 4 1 mfi fii 2 ATTORNEY WITNESSES: w-zzz Z- X 6 UNITED S A S PATENT OFFICE.

NEWITT J. NEALL, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

LIGHTNING-ABRESTER.

To all whom it may concern:

.Beit known that I, NEWITT J. 'NEALL, a citizen of the United States and a resident of Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Lightning-Ar resters, of which the following is a specification.

' My invention relates to lightning arresters for electrical circuits, and it has'for its'object to provide an improved structure and arrangement of parts for such devices. A form of lightning arrester which'has been found successful 1n practice comprises circuits for connecting each of the distributing conductors to the ground, each of which includes a spark gap'and a discharge block that ofl'ers but little opposition to the assage of high frequency currents but w 'ch effectively prevents the passage of dynamo currents.

The discharge blocks may be composed of a mixture of suitable conducting particles or bodies, a non-conducting filler and a binder which facilitates forming the mixture into blocks, the mixture being such that the conductin particles or bodies are held in a substantia lyinvariable out-of-contact relation, thereby providing a large number of paths for discharges. My invention applies particularly to lightning arresters that embody such devices. T

The single figure of the accompanying drawing is a view, in vertical section, of a device constructed in accordance with my invention.

preferably enameled to prevent the absorption of moisture. A conducti lead 5 that .is adapted to be connected to t e ground, is

soldered or otherwise connected 'to the plate 3. The block 1 and the plates 2' and 3 are sup orted in position between blocks 6 and 7 o porcelain orother insulating material, the inner faces of which are provided with recesses 8 into which the bosses 4 project for the purpose of preventing relative displace- Specification 01 Letters Patent; Application filed January 24, 1906. Serial No. 297,691.

. the A fiat, cylindrical discharge block 1 is Patented march 17, 1908.

ment of the engaging parts. 'A piece of suitable insulating material 9, such as fishpaper or fuller-board, is interposed between i the block 7 and the plate 3 and a gasket 10 is interposed between the block 7 and the inner face of the lower halfof an inclosing and supporting casing-.12, bothbeing for the purpose of affording cushions for the insulating block 7. p

One or more sheets 13 of-suita-ble insulating materiaL'such as mica, having central apertures 14, are placed betweenthe porcelain block 6 and 'the. plate 2' and a dish shaped terminal plate 1.5,that is'located in a central recess 16 in the block 6, is placed with its concave face towardi'the insulating sheets 13 The plate 15 is provided with a central boss 17 that'is punched therefrom or formed in any other suitable manner and is'located directly over the apertures 14in the mica sheets 13, an air-gap being thereby provided between the boss 17 and the 'plate 2. The width of the air-gap may be ad'usted by varying the number or thickness 0 the mica sheets. The parts are all clamped-together by means of a set-screw 19 that is threaded into a rib 20in the interior of thelower half of the inclosing casing 12. A dish-shaped plate 21, havin a central aperture through which a reduce portion 22 of the set-screw projects, is placed with its concave face toward the insulatin block 6 and serves as a wearing piece and a ords mechanical rotection to the'insulating block 6, a gas at 23 being interposed between .the late 21 and lock 6 forthe purpose 0 afiording a cushion-for the block.

The discharge blocks may be composed of granulated carbgggndg m or other suitable refracto con uctin material, or of a material of ed com osltlon that is produced compos1 1on5.

Another com osition which has been found useful an which forms the subjectmatter of another ap lication, Serial No.

297.690, filed by me 0 even date herewith,

tionwith a with a central recess in which the terminal material, such as 'mixtureof magnesium oxid and m com rises bodies or ellets of car b g rpndum or ot er suitable con ucting substances, sucli as have been described, that are first coated with an insulatin and preferably porous ecla and which are secured to ether-by means of a suitable insulating filler and binder, such as fireclay, a .ss m' chlorid or dmerfifiHe compositions whicli 10 -'lialifiibiiqan described. v

I claim as my invention; 1. In a lighstm'ng arrester, the combinaplates rotided wit lateral (pgoilections an secure to the faces of said c arge block, of insulating blocks that support the discharge block and are provide with central recesses and with other recesses into which the lateral pro'ections of the conducting plates are seate a terminal plate located in the central recess in one of the insulating blocks and provided with a boss, insulating sheets having apertures inte osed between the terminal the discharge lock and directly opposite the boss on the terminal plate, and means for clam ing the parts together.

' a 2. a lightnin arrester, the combination with a discharge b ock and conducting plates secured to the faces thereof, of an a ertured sheet of insulating material secure to cine of the conducting plates, a terminal piece having a boss located directly opposite the aperture in the insulating sheet, and insulating blocks for supporting the discharge block and for securing the terminal plate in position.

3. In a light arrester, the combination with a discharge b ock, conducting. plates secured to the faces thereof, and means for making circuit connection to one of the plates, of a terminal plate having a boss, an apertured insulating sheet interposed between the terminal plate and the other 'con-. ducting plate u on the face of the dischargeblock, and ins ating blocks for supporting the discharge block, one of which is provide plate is located.

4. In a lightnin arrester, the combination with a dischar e bIock, conducting plates secured to the aces thereof, and. meansfor making circuit connection to one of the plates, of an apertured'insulatin sheet inter-v posed between the terminal ate and the, other conducting late'upon the face of the discharge block, insulatin blocks for supporting the discharge blocfi, one of which is provided with-a central recess in which the char e block and conducting.

plate and one o "the plates on site the. boss, and terminal blocks ha terminal plateis located, and means for with a discharge block, conducting plates secured to the faces thereof, and means for making circuit connection to one of the plates, of an apertured insulating sheet interposed between the terminal -p ate and the other conducting plate upon the face of the discharge block, insulating blocks 'for' sup- V porting the discharge block, one of which is provided with a central recess in which the terminal plate is located, an inclosing casing,

and means for clamping and supporting the parts between the walls thereof.

6. Inalight with a discharge b ock, conducting plates secured to the faces thereof and having lateral projections, and means for making circuit connection to one of the plates, of a terminal plate having a boss, a sheet of insulating material interposed between the terminal plate and the other conducting plate upon the face Ofi the discharge block and having an aperture directly opposite the boss, and terminal blocks having recesses in their inner faces in ..which. the conducting plate projections are seated and one of which has a central recess in which the terminal plate is located arrester, the combination -7.v In a lightnin with a discharge bfi cured to the faces of said .block and having outwardly projecting bosses, and means for making circuit connection to oneof the plates, of a terminal plate having a boss, "9. sheet of insulating material inte osed between theterminal plate and the ot er conducting plate and having an aperture directly oppo cesses in their inner surfaces into which the bosses upon the conducting plates'project, an inclosin casing for said arts h means for c amping them toget er in proper position therein;

.8 A lightning arrester comprising a dischar e block, conductingplates secured to the Ewes thereof, an apertured sheet of insulating material secured to one of the conducting plates, a terminal piece covering the aperture in the insulating sheet and insulatary, 190.6.

NEWITT J. N EALL. Witnesses R. B. INGRAM, BIRNEY Hmns.

arrester, the combinationock,- conductingplates se-.

avmg 

